Frame 12

454 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
454
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
7
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Frame 12

  1. 1. Chapter 18 Virtual-Circuit Networks: Frame Relay and ATM Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
  2. 2. 18-1 FRAME RELAY Frame Relay is a virtual-circuit wide-area network that was designed in response to demands for a new type of WAN in the late 1980s and early 1990s. Architecture Frame Relay Layers Extended Address FRADs VOFR LMI Topics discussed in this section:
  3. 3. Figure 18.1 Frame Relay network
  4. 4. VCIs in Frame Relay are called DLCIs. Note
  5. 5. Figure 18.2 Frame Relay layers
  6. 6. Frame Relay operates only at the physical and data link layers. Note
  7. 7. Figure 18.3 Frame Relay frame
  8. 8. Frame Relay does not provide flow or error control; they must be provided by the upper-layer protocols. Note
  9. 9. Figure 18.4 Three address formats
  10. 10. Figure 18.5 FRAD
  11. 11. 18-2 ATM Asynchronous Transfer Mode (ATM) is the cell relay protocol designed by the ATM Forum and adopted by the ITU-T. Design Goals Problems Architecture Switching ATM Layers Topics discussed in this section:
  12. 12. Figure 18.6 Multiplexing using different frame sizes
  13. 13. A cell network uses the cell as the basic unit of data exchange. A cell is defined as a small, fixed-size block of information. Note
  14. 14. Figure 18.7 Multiplexing using cells
  15. 15. Figure 18.8 ATM multiplexing
  16. 16. Figure 18.9 Architecture of an ATM network
  17. 17. Figure 18.10 TP, VPs, and VCs
  18. 18. Figure 18.11 Example of VPs and VCs
  19. 19. Note that a virtual connection is defined by a pair of numbers: the VPI and the VCI. Note
  20. 20. Figure 18.12 Connection identifiers
  21. 21. Figure 18.13 Virtual connection identifiers in UNIs and NNIs
  22. 22. Figure 18.14 An ATM cell
  23. 23. Figure 18.15 Routing with a switch
  24. 24. Figure 18.16 ATM layers
  25. 25. Figure 18.17 ATM layers in endpoint devices and switches
  26. 26. Figure 18.18 ATM layer
  27. 27. Figure 18.19 ATM headers
  28. 28. Figure 18.20 AAL1
  29. 29. Figure 18.21 AAL2
  30. 30. Figure 18.22 AAL3/4
  31. 31. Figure 18.23 AAL5
  32. 32. 18-3 ATM LANs ATM is mainly a wide-area network (WAN ATM); however, the technology can be adapted to local-area networks (ATM LANs). The high data rate of the technology has attracted the attention of designers who are looking for greater and greater speeds in LANs. ATM LAN Architecture LAN Emulation (LANE) Client/Server Model Mixed Architecture with Client/Server Topics discussed in this section:
  33. 33. Figure 18.24 ATM LANs
  34. 34. Figure 18.25 Pure ATM LAN
  35. 35. Figure 18.26 Legacy ATM LAN
  36. 36. Figure 18.27 Mixed architecture ATM LAN
  37. 37. Figure 18.28 Client and servers in a LANE
  38. 38. Figure 18.29 Client and servers in a LANE

×